CMake march hardware

Question

What is the CMake way to enable the equivalent of GCC's -march=, particularly -march=native? Is there really nothing better than CHECK_CXX_COMPILER_FLAG, such as:

include(CheckCXXCompilerFlag) CHECK_CXX_COMPILER_FLAG("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE) if(COMPILER_SUPPORTS_MARCH_NATIVE)     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native") endif() 

Answer 1

Yes, this feature test is an appropriate way to apply the argument to CMAKE_CXX_FLAGS.

Perhaps an improvement might be to hide this behind an option, as @LeviMorrison suggests.

option(OPTIMIZE_FOR_NATIVE "Build with -march=native" OFF)